Skip Navigation
The Endowment for Human Development
The Endowment for Human Development
Improving lifelong health one pregnancy at a time.
Donate Now Get Free Videos

Image Gallery

The Zygote

6 hours

From The Biology of Prenatal Development.Buy Now

Label Key:

1. polar body
2. perivitelline space or subzonal space
3. zona pellucida
4. cell membrane
All ages referenced to fertilization, not last menstrual period.
Zygote
Zygote
Human Zygote
Human Zygote
The Zygote
The Zygote
Two-Cell Human Embryo
Two-Cell Human Embryo
Two-Cell Embryo
Two-Cell Embryo
Three-Cell Embryo
Three-Cell Embryo
Help give babies a healthy start and a healthy future. Donate now.
Buy the Biology of Prenatal Development DVD